Method of cracking excess sludge with γ-ray combined with modified fly ash

A technology for excess sludge and fly ash, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of difficult industrialization and application, long cracking time, and low utilization rate. , to achieve the effect of facilitating industrialization, reducing environmental pollution and reducing treatment costs

Inactive Publication Date: 2018-08-03
YULIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above cracking technologies related to excess sludge all have good results, and the dehydration performance of the excess sludge after cracking is significantly improved, but these technologies either have high operating costs, secondary pollution caused by adding chemicals, or long cracking time, etc. problems, making it difficult to popularize and apply industrially, and the moisture content after cracking is always above 60%
[0004] Fly ash, waste from power plants, currently emits more than 100 million t / year in China, and contains a large number of beneficial ingredients, but the current utilization rate is very small; as for irradiation technology, it is currently widely used in food processing Sterilization and disinfection of food not only prolongs the shelf life, but also has a large number of applications in the environment, such as the sterilization of sewage and sludge. This technology is not only low in cost, effective, safe and reliable, but also easy to promote and apply in industrialization

Method used

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  • Method of cracking excess sludge with γ-ray combined with modified fly ash
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  • Method of cracking excess sludge with γ-ray combined with modified fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Sampling of fly ash and excess sludge:

[0027] The fly ash is taken from the power plant; the remaining sludge is taken from the secondary sedimentation tank of the sewage treatment plant. The water content of the remaining sludge is about 98%-99%, and it is stored at a constant temperature of 4°C until use.

[0028] (2) Preparation of modified fly ash cracking agent:

[0029] Prepare a sodium hydroxide solution with a concentration of 4mol / L, mix the fly ash and the sodium hydroxide solution according to the solid-to-liquid ratio (g / mL) of 1:1, stir well at room temperature, let stand for 3 hours, and bake at 100°C Dry and grind until the particle size is below 2mm, and set aside.

[0030] (3) cracking reaction:

[0031] Take 100mL of excess sludge, add 2g of modified fly ash to it, put it into a 200mL reactor, and stir it fully to obtain sludge slurry. Uniformly irradiate the reactor containing excess sludge and modified fly ash with γ-rays, using an irradiati...

Embodiment 2

[0048] (1) Sampling of fly ash and excess sludge is the same as in Example 1.

[0049] (2) Preparation of modified fly ash cracking agent:

[0050]Prepare a sodium hydroxide solution with a concentration of 4mol / L, mix the fly ash and the sodium hydroxide solution according to the solid-liquid ratio (g / mL) of 1:2, stir well at room temperature, let stand for 3.5 hours, and bake at 100°C Dry and grind until the particle size is below 2mm to obtain modified fly ash;

[0051] (3) cracking reaction:

[0052] Take 100mL of excess sludge, add 4g of modified fly ash to it, put it into a 200mL reactor, and stir it thoroughly to obtain sludge slurry. use 60 Coγ-rays were used to uniformly irradiate the reactor containing excess sludge and modified fly ash, with an irradiation dose of 3 kGy, and then irradiated at room temperature for 20 minutes. After the reaction was completed, the reactor was taken out, and the remaining sludge mixture was centrifuged at 2500r / min for 20min to de...

Embodiment 3

[0058] (1) Sampling of fly ash and excess sludge is the same as in Example 1.

[0059] (2) Preparation of modified fly ash cracking agent:

[0060] Prepare a sodium hydroxide solution with a concentration of 4mol / L, mix the fly ash and the sodium hydroxide solution according to the solid-to-liquid ratio (g / mL) of 1:3, stir well at room temperature, let stand for 4 hours, and bake at 100°C Dry and grind until the particle size is below 2mm to obtain modified fly ash;

[0061] (3) cracking reaction:

[0062] Take 100mL of excess sludge, add 6g of modified fly ash to it, put it into a 200mL reactor, and stir it thoroughly to obtain sludge slurry. Uniformly irradiate the reactor containing excess sludge and modified fly ash with γ-rays at a dose of 5 kGy, and then irradiate at room temperature for 30 minutes. After the reaction was completed, the reactor was taken out, and the remaining sludge mixture was centrifuged at 2500r / min for 20min to detect and analyze the solid-liquid...

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Abstract

The invention relate to a method for breaking excess sludge through combination of gamma rays and modified fly ash. The method includes the following steps of firstly, adding modified fly ash to excess sludge, wherein according to the addition proportion, 2-10 g of modified fly ash is added to every 100 mL of excess sludge, and sludge paste is obtained after the mixture is evenly mixed; secondly, conducting irradiation treatment on the sludge paste through gamma rays so as to break excess sludge. According to the method, modified fly ash is used as a breaking agent, waste is turned into wealth, environment pollution is reduced, the purpose of processing fly ash is achieved, and the processing cost for excess sludge is effectively reduced. In the breaking process, microorganisms in excess sludge are effectively killed by gamma rays, the sludge cell breaking rate is greatly increased, the breaking time of excess sludge is effectively saved, the processing efficiency is enhanced, the breaking effect is remarkable, and broken sludge is free of odor.

Description

【Technical field】 [0001] The invention belongs to the field of sludge treatment and relates to a method for cracking excess sludge by combining gamma rays with modified fly ash. 【Background technique】 [0002] Excess sludge is a kind of flocculent mud particles with high water content (≥97%) produced in the process of sewage treatment. Its treatment has always been a worldwide problem, and improper disposal can easily cause secondary environmental pollution. [0003] Most of the organic matter in excess sludge exists in microbial cells, and the semi-rigid cell wall is a biodegradable inert substance that protects the cells and is difficult to break. Adopting appropriate cracking methods can effectively control the migration and transformation direction of organic matter in the sludge cells during the cracking process, and directly achieve the purpose of "harmless and resourceful" excess sludge. However, if the control means fail, it will have serious consequences for the en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00
Inventor 相玉琳王立鹏李越焦玉荣王若恺陈小康
Owner YULIN UNIV
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